Electrocardiogram (ecg, ekg) is a print-out of the electrical forces detected by electrodes on the chest wall, as electricity travels through the heart with each heart beat. The electrodes are placed in different positions, and each position "sees" the electrical activity of the heart from its own vantage point. Abnormalities in signal detected at chest surface can indicate underlying disease.
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3

You're good:
Glad you got to read up. The hypertrophic cardiomyopathy and ARVD are ruled out by a competent echo. Lots of folks have palpitations -- catch a run on Holter and you will know the type. If you do not get short of breath, and there are five or fewer per minute, they are usually harmless. Taking up hard-core aerobic fitness can help this and make you happier in the process.
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4

The Echo will rule:
out HCM but ARVD will require MRI. It is unlikely you have this. It also sounds like your health care provider is evaluating you thoroughly. Have you gone caffeine and stimulant free yet?
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6

Majority:
Yes, if you are concerned for prolonged QT or there is a family history, all of those tests except for an echo should show prolonged QT syndrome. An echo measures the function of the heart. Prolonged QT is calculated from an ECG looking at the part of the heart that makes up the QT interval in the heart beat. An ECG, stress ECG and Holter ECG should be able to pick it up.
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7

Palpitation:
Fluttering or palpitations can occur due to irregular heart beat like pacs, but some patients can feel it even with a completely normal rhythm. Rest assured that in the absence of a persistent abnormal rhythm pacs, even with fluttering is not dangerous. If you feel it frequently and there get too annoying talk to your dr about non-pharmacological lifestyle changes or medication to suppress them.
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8

Respiratory function:
You've listed a lot of tests that were normal and that is good, but if your primary symptom is "lack of air", it may be worthwhile to perform some simple pulmonary function tests which evaluate your ability to fill your lungs and exhale. Has your doctor evaluated you for asthma or allergies as well?
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9

Relax:
Stress is bad for your heart. Negative EKG is reassuring but does not have predictive value for future events. A negative stress echo is a good indication of low risk of heart attack in next several years. No test is 100%. Consider your risk factors for heart disease. If you remain concerned you should seek a second opinion. PACs are usually benign, but can be very distressing.
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10

Tests:
in your age group the tests you had suggest that you presently have no significant problems with coronary blood flow. You won't get a guarantee for the future but good diet, exercise along with no smoking and medical follow up will be prudent.
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12

No:
You don't say what the QRS duration is, but you either have a right bundle branch block (QRS > 120 ms) or an incomplete RBBB. In either case, if your echo is normal, you have nothing to worry about.
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15

POTS?:
If every test is negative consult your physician about pots ( postural orthostatic syndrome ). Most commonly young females but can happen in males. Heart rate goes up when standing over 30 beats from normal. Other symptoms can be associated. Secondary causes most be r/o like electrolyte unbalance, endocrine disorders, food allergies etc. Consult your physician.
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18

Stay fit:
I'm simply glad he's exercising & hope he keeps it up. Many people have a left bundle branch block for no reason -- i think it's a minor developmental variant. I'm also going to assume that these are common palpitations and there's no reason to think it's a channelopathy or v-tach. Trusting he's not overdoing caffeine. I'm betting no cause will be found and that these will not be a problem.
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